yes they were attacked before from the ground floors, a unsucessful bomb attempt, dont remember if anyone died, but it failed.

In the 1993 World Trade Center bombing (February 26, 1993) a car bomb was detonated below Tower One of the World Trade Center in New York City. The 1,500-lb (680 kg) urea nitrate-hydrogen gas enhanced device[1] was intended to knock the North Tower (Tower One) into Tower Two, bringing both towers down and killing thousands of people.[2][3] It failed to do so, but did kill six people and injured 1,042.

The bomb exploded in the underground garage at 12:19 P.M., generating a pressure estimated over one GPa and opening a 30-meter-wide hole through four sublevels of concrete. The detonation velocity of this bomb was about 15,000 ft/s (4.5 km/s). A quote from the claim of responsibility letter written by one of the terrorists went as follows: "We are, the Liberation Army fifth battalion, again. Unfortunately, our calculations were not very accurate this time. However, we promise you that next time it will be very precise and World Trade Center will continue to be one [of] our targets unless our demands have been met." Out of the thousands injured, more would die due to the caliber of their injuries.

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